The term boost post indicates the paid advertisements on social media platforms used to promote an existing post from a business page. Brands pay to display their boost posts to the target audience that does not follow their social accounts.

It is an easy way to promote your existing posts to people who are more likely to see and engage with your content. When you boost a post, it appears higher in the News Feed, so there’s a better chance people will see it. You can choose how long you want your boost to run and how much money you want to spend.

Example

Source :Hubspot